{
 "generated_utc": "2026-07-31T23:28:07Z",
 "gfs_cycle_utc": "2026-07-31T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260731_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260731_18Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 249750
 },
 "flights": [
  {
   "callsign": "AE0SS-9",
   "flight_id": "AE0SS-9_2026-07-12",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 01:40:35",
   "seed_lat": 33.85425,
   "seed_lon": -115.42858,
   "seed_alt_m": 14321.0,
   "seed_age_h": 309.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 26.44622,
    "lon": -112.67543,
    "alt_m": 14319.1
   },
   "member_spread_deg": {
    "lat": 57.86,
    "lon": 170.09
   },
   "member_spread_now_deg": {
    "lat": 31.63,
    "lon": 58.42
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:53:40",
   "seed_lat": -58.75,
   "seed_lon": -146.45832,
   "seed_alt_m": 12150.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 23:00:00",
    "lat": -40.98888,
    "lon": 110.76122,
    "alt_m": 12449.5
   },
   "member_spread_deg": {
    "lat": 16.65,
    "lon": 48.57
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 173.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 32.69625,
    "lon": -154.28797,
    "alt_m": 13463.2
   },
   "member_spread_deg": {
    "lat": 63.44,
    "lon": 124.57
   },
   "member_spread_now_deg": {
    "lat": 22.22,
    "lon": 84.27
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 12:50:18",
   "seed_lat": 56.52083,
   "seed_lon": 13.66667,
   "seed_alt_m": 12770.0,
   "seed_age_h": 58.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 59.11197,
    "lon": -175.13121,
    "alt_m": 12789.0
   },
   "member_spread_deg": {
    "lat": 36.96,
    "lon": 358.55
   },
   "member_spread_now_deg": {
    "lat": 12.04,
    "lon": 17.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:16:18",
   "seed_lat": 39.22917,
   "seed_lon": -35.625,
   "seed_alt_m": 14540.0,
   "seed_age_h": 5.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 46.31966,
    "lon": 58.06751,
    "alt_m": 14149.0
   },
   "member_spread_deg": {
    "lat": 15.56,
    "lon": 61.39
   },
   "member_spread_now_deg": {
    "lat": 2.59,
    "lon": 1.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:24:00",
   "seed_lat": 30.5625,
   "seed_lon": -169.29167,
   "seed_alt_m": 13080.0,
   "seed_age_h": 0.93,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 22:00:00",
    "lat": 33.71499,
    "lon": -155.22022,
    "alt_m": 12979.6
   },
   "member_spread_deg": {
    "lat": 18.35,
    "lon": 76.54
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 159.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 67.98236,
    "lon": 19.26726,
    "alt_m": 12547.8
   },
   "member_spread_deg": {
    "lat": 22.32,
    "lon": 203.04
   },
   "member_spread_now_deg": {
    "lat": 21.18,
    "lon": 96.32
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:53:00",
   "seed_lat": 36.27083,
   "seed_lon": 179.29167,
   "seed_alt_m": 14030.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-07 23:00:00",
    "lat": 38.58222,
    "lon": -119.83775,
    "alt_m": 13897.9
   },
   "member_spread_deg": {
    "lat": 54.27,
    "lon": 343.51
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 03:57:00",
   "seed_lat": 52.0,
   "seed_lon": 80.625,
   "seed_alt_m": 13010.0,
   "seed_age_h": 19.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 73.30793,
    "lon": -112.37986,
    "alt_m": 13009.6
   },
   "member_spread_deg": {
    "lat": 47.36,
    "lon": 323.14
   },
   "member_spread_now_deg": {
    "lat": 2.82,
    "lon": 5.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 80.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 40.76861,
    "lon": 44.50964,
    "alt_m": 9108.0
   },
   "member_spread_deg": {
    "lat": 44.07,
    "lon": 188.23
   },
   "member_spread_now_deg": {
    "lat": 17.91,
    "lon": 37.05
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 151.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 71.04786,
    "lon": -111.59371,
    "alt_m": 8645.3
   },
   "member_spread_deg": {
    "lat": 44.06,
    "lon": 331.46
   },
   "member_spread_now_deg": {
    "lat": 30.47,
    "lon": 60.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 63.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 39.87111,
    "lon": -33.7736,
    "alt_m": 12569.0
   },
   "member_spread_deg": {
    "lat": 26.81,
    "lon": 132.36
   },
   "member_spread_now_deg": {
    "lat": 12.53,
    "lon": 32.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 63.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 42.18855,
    "lon": -33.13852,
    "alt_m": 12463.7
   },
   "member_spread_deg": {
    "lat": 37.27,
    "lon": 128.92
   },
   "member_spread_now_deg": {
    "lat": 12.81,
    "lon": 32.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 05:28:00",
   "seed_lat": 66.8125,
   "seed_lon": 24.20833,
   "seed_alt_m": 12380.0,
   "seed_age_h": 17.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 64.67922,
    "lon": -173.85586,
    "alt_m": 12609.7
   },
   "member_spread_deg": {
    "lat": 44.52,
    "lon": 311.13
   },
   "member_spread_now_deg": {
    "lat": 6.2,
    "lon": 8.84
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 179.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 71.90093,
    "lon": -95.6375,
    "alt_m": 15221.7
   },
   "member_spread_deg": {
    "lat": 31.11,
    "lon": 290.69
   },
   "member_spread_now_deg": {
    "lat": 19.66,
    "lon": 357.69
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 21:33:00",
   "seed_lat": 59.875,
   "seed_lon": 143.95833,
   "seed_alt_m": 12840.0,
   "seed_age_h": 1.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 21:00:00",
    "lat": 55.23499,
    "lon": -62.15362,
    "alt_m": 12598.8
   },
   "member_spread_deg": {
    "lat": 30.62,
    "lon": 91.65
   },
   "member_spread_now_deg": {
    "lat": 0.63,
    "lon": 0.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 203.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 29.97659,
    "lon": 155.25316,
    "alt_m": 14214.7
   },
   "member_spread_deg": {
    "lat": 54.35,
    "lon": 349.6
   },
   "member_spread_now_deg": {
    "lat": 41.55,
    "lon": 295.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 16:35:37",
   "seed_lat": 31.33328,
   "seed_lon": -13.375,
   "seed_alt_m": 13390.0,
   "seed_age_h": 6.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 47.08672,
    "lon": 123.65379,
    "alt_m": 13274.4
   },
   "member_spread_deg": {
    "lat": 11.74,
    "lon": 27.05
   },
   "member_spread_now_deg": {
    "lat": 1.3,
    "lon": 1.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 112.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 30.3879,
    "lon": 152.92608,
    "alt_m": 13030.5
   },
   "member_spread_deg": {
    "lat": 65.26,
    "lon": 311.17
   },
   "member_spread_now_deg": {
    "lat": 29.74,
    "lon": 346.66
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-422-10",
   "flight_id": "KC3LBR-422-10_2026-01-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 21:57:02",
   "seed_lat": -26.39583,
   "seed_lon": -68.16667,
   "seed_alt_m": 14380.0,
   "seed_age_h": 289.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": -28.20435,
    "lon": -138.65404,
    "alt_m": 14372.0
   },
   "member_spread_deg": {
    "lat": 50.7,
    "lon": 212.9
   },
   "member_spread_now_deg": {
    "lat": 31.35,
    "lon": 311.02
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:57:04",
   "seed_lat": 70.27083,
   "seed_lon": -141.83333,
   "seed_alt_m": 13310.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 23:00:00",
    "lat": 57.52259,
    "lon": -49.3835,
    "alt_m": 13348.9
   },
   "member_spread_deg": {
    "lat": 13.56,
    "lon": 79.1
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 86.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 67.52254,
    "lon": 102.06797,
    "alt_m": 12847.7
   },
   "member_spread_deg": {
    "lat": 23.72,
    "lon": 291.41
   },
   "member_spread_now_deg": {
    "lat": 19.06,
    "lon": 28.07
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 09:45:43",
   "seed_lat": 65.74995,
   "seed_lon": 26.6667,
   "seed_alt_m": 12780.0,
   "seed_age_h": 13.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 64.39124,
    "lon": -172.63494,
    "alt_m": 12866.0
   },
   "member_spread_deg": {
    "lat": 24.64,
    "lon": 312.56
   },
   "member_spread_now_deg": {
    "lat": 5.96,
    "lon": 6.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:36:00",
   "seed_lat": 51.125,
   "seed_lon": -138.04167,
   "seed_alt_m": 12060.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 22:00:00",
    "lat": 54.36087,
    "lon": -102.34123,
    "alt_m": 12222.2
   },
   "member_spread_deg": {
    "lat": 11.92,
    "lon": 56.03
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 21:01:00",
   "seed_lat": 47.97917,
   "seed_lon": -43.625,
   "seed_alt_m": 12370.0,
   "seed_age_h": 2.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 20:30:00",
    "lat": 30.82508,
    "lon": -29.42288,
    "alt_m": 12523.5
   },
   "member_spread_deg": {
    "lat": 28.83,
    "lon": 146.02
   },
   "member_spread_now_deg": {
    "lat": 0.58,
    "lon": 1.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:05:27",
   "seed_lat": 29.45828,
   "seed_lon": -93.95829,
   "seed_alt_m": 12400.0,
   "seed_age_h": 1.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 21:30:00",
    "lat": 22.09019,
    "lon": -124.645,
    "alt_m": 12262.5
   },
   "member_spread_deg": {
    "lat": 40.23,
    "lon": 59.36
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 16:50:45",
   "seed_lat": 68.39578,
   "seed_lon": 25.50002,
   "seed_alt_m": 13210.0,
   "seed_age_h": 6.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 69.50553,
    "lon": -78.8974,
    "alt_m": 13420.6
   },
   "member_spread_deg": {
    "lat": 23.53,
    "lon": 293.82
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 9.61
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KL7BB-1",
   "flight_id": "KL7BB-1_2026-06-24",
   "payload_type": "APRS",
   "seed_time": "2026-07-18 17:48:12",
   "seed_lat": 60.94767,
   "seed_lon": 14.502,
   "seed_alt_m": 12261.0,
   "seed_age_h": 317.53,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 68.93736,
    "lon": 31.85453,
    "alt_m": 11990.8
   },
   "member_spread_deg": {
    "lat": 26.12,
    "lon": 327.88
   },
   "member_spread_now_deg": {
    "lat": 26.63,
    "lon": 282.21
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KO6FE-15",
   "flight_id": "KO6FE-15_2025-11-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 07:56:00",
   "seed_lat": 49.39583,
   "seed_lon": 101.95833,
   "seed_alt_m": 12920.0,
   "seed_age_h": 303.4,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 56.2677,
    "lon": 147.15038,
    "alt_m": 12474.9
   },
   "member_spread_deg": {
    "lat": 68.49,
    "lon": 322.54
   },
   "member_spread_now_deg": {
    "lat": 43.61,
    "lon": 329.89
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 23:53:19",
   "seed_lat": -24.02088,
   "seed_lon": -135.08331,
   "seed_alt_m": 14600.0,
   "seed_age_h": 239.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": -21.10409,
    "lon": -37.1408,
    "alt_m": 14575.5
   },
   "member_spread_deg": {
    "lat": 42.75,
    "lon": 133.81
   },
   "member_spread_now_deg": {
    "lat": 33.86,
    "lon": 179.07
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "PC4L-11",
   "flight_id": "PC4L-11_2026-07-16",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 12:46:26",
   "seed_lat": 42.93908,
   "seed_lon": 39.39383,
   "seed_alt_m": 11696.0,
   "seed_age_h": 130.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 34.85472,
    "lon": 177.85931,
    "alt_m": 12196.4
   },
   "member_spread_deg": {
    "lat": 41.51,
    "lon": 326.81
   },
   "member_spread_now_deg": {
    "lat": 45.83,
    "lon": 37.82
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "SP0LND-12",
   "flight_id": "SP0LND-12_2026-07-16",
   "payload_type": "APRS",
   "seed_time": "2026-07-18 10:05:46",
   "seed_lat": 66.80809,
   "seed_lon": 43.675,
   "seed_alt_m": 13484.0,
   "seed_age_h": 325.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 40.46664,
    "lon": -92.29837,
    "alt_m": 14225.1
   },
   "member_spread_deg": {
    "lat": 95.2,
    "lon": 328.75
   },
   "member_spread_now_deg": {
    "lat": 59.52,
    "lon": 334.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-07-25",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
   "seed_lat": 44.85792,
   "seed_lon": 29.04891,
   "seed_alt_m": 13803.0,
   "seed_age_h": 130.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 54.63027,
    "lon": -118.14939,
    "alt_m": 13754.2
   },
   "member_spread_deg": {
    "lat": 30.03,
    "lon": 129.71
   },
   "member_spread_now_deg": {
    "lat": 16.1,
    "lon": 53.25
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "SP2ROC-1",
   "flight_id": "SP2ROC-1_2026-03-14",
   "payload_type": "APRS",
   "seed_time": "2026-07-22 14:00:27",
   "seed_lat": 40.10083,
   "seed_lon": 44.614,
   "seed_alt_m": 14644.0,
   "seed_age_h": 225.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 30.57767,
    "lon": 46.1373,
    "alt_m": 14847.5
   },
   "member_spread_deg": {
    "lat": 50.54,
    "lon": 156.55
   },
   "member_spread_now_deg": {
    "lat": 33.89,
    "lon": 67.27
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-12",
   "flight_id": "SP2ROC-12_2026-06-24",
   "payload_type": "APRS",
   "seed_time": "2026-07-18 09:07:40",
   "seed_lat": -5.7945,
   "seed_lon": 103.60775,
   "seed_alt_m": 14944.0,
   "seed_age_h": 326.21,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 2.95744,
    "lon": -53.08194,
    "alt_m": 14939.5
   },
   "member_spread_deg": {
    "lat": 35.97,
    "lon": 251.0
   },
   "member_spread_now_deg": {
    "lat": 20.57,
    "lon": 267.86
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 16:06:30",
   "seed_lat": 65.72917,
   "seed_lon": 24.33333,
   "seed_alt_m": 15400.0,
   "seed_age_h": 31.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 64.13081,
    "lon": 138.26482,
    "alt_m": 15184.4
   },
   "member_spread_deg": {
    "lat": 19.34,
    "lon": 31.35
   },
   "member_spread_now_deg": {
    "lat": 2.64,
    "lon": 13.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 03:17:00",
   "seed_lat": -22.31248,
   "seed_lon": 162.875,
   "seed_alt_m": 14160.0,
   "seed_age_h": 260.05,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": -37.07895,
    "lon": 71.67168,
    "alt_m": 13630.7
   },
   "member_spread_deg": {
    "lat": 36.91,
    "lon": 190.68
   },
   "member_spread_now_deg": {
    "lat": 19.72,
    "lon": 329.19
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
   "seed_lat": 74.5625,
   "seed_lon": -160.0,
   "seed_alt_m": 12890.0,
   "seed_age_h": 4.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 18:15:00",
    "lat": 56.33791,
    "lon": 146.54974,
    "alt_m": 12794.6
   },
   "member_spread_deg": {
    "lat": 24.13,
    "lon": 162.35
   },
   "member_spread_now_deg": {
    "lat": 1.84,
    "lon": 2.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3OCL-48",
   "flight_id": "VE3OCL-48_2026-05-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-18 11:55:00",
   "seed_lat": 45.41667,
   "seed_lon": -81.20833,
   "seed_alt_m": 16030.0,
   "seed_age_h": 323.42,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": 61.48337,
    "lon": 151.0525,
    "alt_m": 15405.5
   },
   "member_spread_deg": {
    "lat": 50.68,
    "lon": 220.14
   },
   "member_spread_now_deg": {
    "lat": 41.47,
    "lon": 230.86
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 19:01:00",
   "seed_lat": 31.25,
   "seed_lon": -52.20833,
   "seed_alt_m": 13630.0,
   "seed_age_h": 4.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 18:30:00",
    "lat": 22.48418,
    "lon": -81.65259,
    "alt_m": 13674.5
   },
   "member_spread_deg": {
    "lat": 18.2,
    "lon": 16.02
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0DLK-1",
   "flight_id": "W0DLK-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 06:43:47",
   "seed_lat": 46.18745,
   "seed_lon": 121.75004,
   "seed_alt_m": 12630.0,
   "seed_age_h": 256.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 46.93918,
    "lon": -4.54891,
    "alt_m": 12864.9
   },
   "member_spread_deg": {
    "lat": 59.28,
    "lon": 247.05
   },
   "member_spread_now_deg": {
    "lat": 53.29,
    "lon": 166.74
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 22:40:23",
   "seed_lat": 43.22911,
   "seed_lon": -98.95831,
   "seed_alt_m": 13630.0,
   "seed_age_h": 0.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 22:15:00",
    "lat": 51.78134,
    "lon": 65.87499,
    "alt_m": 13382.0
   },
   "member_spread_deg": {
    "lat": 32.11,
    "lon": 149.65
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0ZC-15",
   "flight_id": "W0ZC-15_2026-07-10",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 15:52:12",
   "seed_lat": 67.67675,
   "seed_lon": 24.87034,
   "seed_alt_m": 12127.0,
   "seed_age_h": 295.46,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 79.02591,
    "lon": -73.49167,
    "alt_m": 12359.2
   },
   "member_spread_deg": {
    "lat": 25.82,
    "lon": 231.69
   },
   "member_spread_now_deg": {
    "lat": 22.91,
    "lon": 149.94
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "WX8TOM-12",
   "flight_id": "WX8TOM-12_2026-07-18",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 14:16:04",
   "seed_lat": 52.31942,
   "seed_lon": 14.9975,
   "seed_alt_m": 12988.0,
   "seed_age_h": 297.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 63.01477,
    "lon": -85.76876,
    "alt_m": 13177.3
   },
   "member_spread_deg": {
    "lat": 30.5,
    "lon": 241.68
   },
   "member_spread_now_deg": {
    "lat": 18.34,
    "lon": 300.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "YU9OMT-1",
   "flight_id": "YU9OMT-1_2026-05-24",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 12:50:00",
   "seed_lat": 39.60417,
   "seed_lon": 35.08336,
   "seed_alt_m": 11370.0,
   "seed_age_h": 130.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": 72.23869,
    "lon": -39.9149,
    "alt_m": 11479.9
   },
   "member_spread_deg": {
    "lat": 51.49,
    "lon": 325.51
   },
   "member_spread_now_deg": {
    "lat": 40.93,
    "lon": 60.62
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
   "seed_lat": -23.70833,
   "seed_lon": 149.29167,
   "seed_alt_m": 12380.0,
   "seed_age_h": 18.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": -15.84121,
    "lon": 2.77378,
    "alt_m": 12619.0
   },
   "member_spread_deg": {
    "lat": 27.08,
    "lon": 101.31
   },
   "member_spread_now_deg": {
    "lat": 4.4,
    "lon": 18.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
   "seed_lat": -7.75,
   "seed_lon": 8.375,
   "seed_alt_m": 13090.0,
   "seed_age_h": 104.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:45:00",
    "lat": -14.91802,
    "lon": -44.65584,
    "alt_m": 13039.2
   },
   "member_spread_deg": {
    "lat": 26.9,
    "lon": 138.56
   },
   "member_spread_now_deg": {
    "lat": 19.95,
    "lon": 124.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
   "payload_type": "WSPR",
   "seed_time": "2026-07-20 01:53:00",
   "seed_lat": -22.0625,
   "seed_lon": -151.29167,
   "seed_alt_m": 13360.0,
   "seed_age_h": 285.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-07 17:30:00",
    "lat": -37.72531,
    "lon": 133.90658,
    "alt_m": 12553.5
   },
   "member_spread_deg": {
    "lat": 34.03,
    "lon": 249.74
   },
   "member_spread_now_deg": {
    "lat": 14.48,
    "lon": 349.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}